chapman



July 3, 192s. 1,615,449

W. H. CHAPMAN WORK HOLDER Filed June 6, 1924 2 sheets-'sheet 1 insta.. 'x15 w. H. CHAPMAN won-x HOLDER Filed June e, 1924 2 sheets-sheet 2 if l Il il Patented July 3, 1928.

UNITED STATES 1,675,449 PATENT oFFlcE.

WILLIAM H. CHAPMAN, OF MONTCLAIR, NEW JERSEY, ASSIGNOR TO GENERAL MOTORS CORPORATION, OF DETROIT, MICHIGAN, A CORPORATION OF DELAWARE.

yWORK HOLDER.

Application led .Tune 6,

This inventif'n'i relates to Work holders and is herein shown as embodied in apparatus for holding hollow sleeves and the like for grinding.

Aln the manul'acture of sleeves or rings, one practice is to support vthe sleeves on an arbor between head and tail stocks which rotate the worlr during the operation oi' a tool. It advantageous to work simultaneously on a number of sleeves heldin axial alignment but it is a very fatiguing operation for an operator to hold the heavy arbor and its sleeves V'while bringing the tail stock to sinmortingl and centering position. The operation of removing the work pieces and substituting others has hitherto been slow and unsatisfactory.

An object oit the invention therefore is to provide a work holder which will relieve the operator of the necessity of supporting heavy weights when inserting the work pieces in the machine; Another object is to 'provide a. work holder by means of which the greater part o'f the delay incident to changing work pieces can be overcome.

To these ends and also to improve generally upon devices of the character indicated my invention consists in the various matters hereinafter described and claimed.

Referring to the drawings, Figure l is la vertical longitudinal section through the left hand 'portion oi the'apparatus.

Figure 2 is a vertical longitudinal section through the right hand portion of the apparatus, the draw rod being shown in an oilniosite cxtreme position from the position shown in Figure l.

Figure 3 is a perspective view of the quick detachable holder or clamping member.

Figure l is a left hand end elevation showing the rod operating mechanism.

Figure 5 is a :trent elevation of a portion o'i the rod operating mechanism of Figure 4.

Figure 6 is a vertical longitudinal section through the intermediate portion of the apparatus and Figure 7 is a section on the line 7*-7 of Figure (i.

G- indicates a. tool, herein shown as a wide grinding wheel, adapted to operate on a number of work pieces W, herein shown as hollow sleeves. The wheel is mounted to engage the rear outer surface of the work pieces for external grinding and is prefer ably given a slight axial reciprocation to 1924. Serial No. 718,313.

insure even wear. The work pieces WV are in axial alignment and are clamped `against one another and against a shoulder l0 on a bushing 12 which is supported and driven by a hollow spindle or arbor lll. The bushing hasdriving lugs 1G projecting from the shoulder and engaging driving pins 18 slidably mounted in a head 2O integral with the spindle. The spindle has one portion surrounding and spaced from an axially movable rod 22 and another portion splined to the rod by a key 24 slidable in a slot of the spindle. A quick detachable clamping member or holder 26 abuts against the endmost work piece WV and clamps all of the work pieces against each other and against the shoulder l0. The member 26 is substantially U-shaped and comprises a disc having a slot 28 to straddle the rod 22 and a rear spherical face 30 cooperating with a correspond face on a nut or limit member 32 threaded on the rod. The spherical faces allow the member 26 to align itself and bear uniiormly against the endmost work piece.v The nut 32 is secured by a locking nut 34:, and the clamping member 26 has a iinger piece 36 spaced 'from the nuts so that it can be lifted from the rod 22 to release the work When the rod and the nuts are moved to the right. The nuts are of smaller diameter than the bushing so that the latter can be slid olf endwise. The head 20 has a recess receiving a cross piu 3S passing through the shaft and aligned with the ends of the driving pins 18 which also servev as knoclco'ii pins to loosen the bushing from the spindle. Upon sliding the rod 22 to the right, the clamping member 26 can be lifted and the loosened bushing and the work pieces can be removed by axial movement. Then a second bushing, previously loaded with work pieces, can be slid onto the spindle and clamped in position by applying the member 26 and sliding the rod 22 to the left by mechanism which will be hereinafter described.

The head 2() is fastened by screws to a collar 4() threaded on the end oi? a hollow driven sleeve 42 supported in plain half bearings 44: and 46 in a casing L.i8 which is slidable in vways on the machine frame. The half bearings are arranged downwardly and towards the front and the half bearing 114 is enclosed at the top and rear by a bearing cap having a radial recess slidably supporting a bearing block 52 which conforms to the outer 'surface of they driven sleeve 42. The block is adjustable by means of a hand screw 54 which can be locked in position by am lock nut 5,6. The purpose of the bearing block iS. tov force the driven sleeve against thel plain half bearing 44 to reduce the oil Y a single 'rowv` ball bearing 76 the outer race ringed1 which can slide in its supporting casingl Lubricant is supplied to double ro'wv bearing through the inlet 7 8f small amount of oil from the Worm. Wheel'casing is allowed to circulate through the vplain"bearing 44 by passing" through a longitudinally ez'tending passage 80 which isiclfosedl the outer-Mend a ring 82 and a flaileedrna Mythes@ being" faStene-d by screivsfto the casing and embracing a collar 86 yon!` the sleeve v42. Suitable packing may beinserted betiveen the rings. Bearing 44 terminatesshort of the ring 82.4 rlhe halt beaiing'l has an oil filml take-up similar to that'oi the hearing 44, being closed at the top and rear a bearing cap 88 enclos.- ing av bearing block 90 adjustedby a hand screw 92. Oil is allowedto circulate around the bearing 46` by passing from the worm i ylvheel casing v through a longitudinal gr/@nove The casing 48y has a shouldered recess the left rec'iving'an inner race ring .1.00, a central ring 102," and an outer, race ring l104, :r'oivs' of balls being interposed between"k the central raeiring and the others. The Central ring is supported on a hanged sleeve 1 ()6 ijtting against a shoulder von the driven sleeve 42 and clamped by`nuts168 threadedon the endof'the 'driven sleeve. The central ring 102 is clamped againstthe flange of sleeve 106 by a ring 1,10 interposed between it and the nuts 108. The outer race ring10 .4 of the thrust bearing is: heldV against axial movement an annular flange'112 orn'ied on'abasin'g 114 attached byiserexvs 116x tok the casingv 48. The sleeve 42 is Athus suppeiited .for rotary movement by the plain bearings and is held against axiall movement thrust bearings. The sleeve is hollow and the bore isy larger than the rody 22 to alldvelatter to have easy sliding mojve.

IIIe-.Ht endxWSe The sleeve 42 has its borey enlarged at the left, to Areceive a shouldered sleeve 118 which slidably supports the left end of the rod 22. A disc' 122 is threaded on the sleeve 118 and fastened lby a radial plugv 124 having an abutting locking screw 126. A rectangular,

rotatable yoke 128 surrounds the rodr22`and carriesv a coupleof threea'rmed levers 130 pivoted at 132 and each having a nose 134 engaging the disc 122 near the periphery. Each lever also has an inwardly extending arin`188, ythe nose 4of which engages the end of a nut 140 threaded on the rod 22am@ fastened a set s v 'lhe yoke has its huh/'142 sllipvpo'rted onl this nut. The long arms 144 of the three armed levers bear against a conyex cam surface 146 on a slidable carrier which isfgrooved at 150 t0 receive e .Split band 1.52 having oppositely lextendingl pins h154 trunnioned (the arms fer-k 156y depending from and keyedy to a'xrofck shaft y16() ]"ournalled at 158 on the casing "The rochl shaft is alSQ journalled in 'the upper end of a bracket 162 having: alug164resting on il tongue 166 of ,the machine frame to which the bracket is boleed. dependingarmI 168,*keyedfto .the roc( shaft isoonne'cted bya Vlink 170 tol a hand lever 17 pivoted at 174` to', the frame.y

ln operation, a bashing 12,Jloaded with Work pieces, isslipped ever the spindle 14. Then the clamping member 26 is 'slipped over .the shaft andthe hand lever 172 iS manipulated to draw thered to the left. This n iovement is effected through the cam andthe three levers,the cam carrier 148 sliding' to the lleft and forcing the arms 144 out-yvaidly untilthey reach a looked position duetoA the contour of the cani. 'lzhe outwardf'moverent. of theV arms 144A causes the leversto pivot and their vinwardly leip-L tending armas 188,y engage nut 140 and slide rod 22 to the leftuntil the Work pieces are irmly clamped against the shoul-` der 10. The` bushing'vvith its'work'pieces is iol? released for` i'epladementv by, another, pre f vidusly loaded bushingfby moving the 4parts inthe reverseorder.V i i Although the linvention has been described by refereneeto a certain 'specificaconstruetion, it s hoiilld be understood that, in its broader aspects, it is, not necessarily limited thereto. i i 'i l claim: i

1. In apparatusy df the character described, a rotary/cylindrical spindle for supporting a hollow Work piece, a hollow cylin* drical bushing sleeved on the spindle, said bushiee' bei-ns1 slid-able. Dit' eed. 011th@ Sri-Hdl@ for loading, a limit device associated. with the spindle, a quick detachable, member elle easing the. limit 'dette and. Contacting with the Worlcpieceto hold thelatter on thespinw die, means extending through the, spindle.

ile

2. In apparatus of the character described, a rotary cylindrical spindle for supporting a hollow work piece, a hollow cylindrical bushing sleeved on the spindle and having a shoulder abutting the end of a work piece, said bushing being slidable oif and on the spindle :tor loading, a movable limit device associated with the spindle, and a quiclr detachable member engaging the limit device and arranged to hold the work piece against said shoulder; substantially as described.

In apparatus of the character described, a rotary spindle, a hollow cylindrif cal bushing sleeved on the spindle for hold ing a plurality of hollowr work pieces in axial alignment, said bushing being slidable oli' and on the spindle for loading, and means for removably holding the bushing with its work pieces on the spindle; substantially as described.

a. In apparatus of the class described, a rotary spindle, a plain cylindrical bushing sleeved on the spindle for supporting a `plurality of hollow work pieces in axial alignment, said bushing being slidable orf and on the spindle tor loading, a member extending beyond the end of the bushing and supporting a limit device smaller than the bore of the worlr pieces, and a detachable U-shaped member insertable radially between the limit device and the endniost work piece; substan tially as described.

5j In apparatus of the class described, a hollow spindle, a hollow cylindrical bushing sleeved on the spindle 'for supporting a plurality of hollow work pieces in axial alignment, said bushing being slidable oilA and on the spindle for loading and having a Work abutting shoulder, a rod extending through the spindle, and means at the end of the rod to detachably hold the work pieces and the bushing on the spindle; substantially as described.

6. In apparatus of the character described, a hollow cylindrical spindle having means to enter and support a hollow work piece, and mechanism for clamping the work piece on the spindle, said mechanism comprising a rod keyed to the spindle, a member near the end of the rod to engage the work piece, leverage applying mechanism for moving the rod, and means operated by the rod to release the work piece from the spindle; substantially as described.

7. In apparatus oit the character described, a rotary cylindrical spindle for entering and supporting a hollow work piece, a head on the spindle having openings parallel to its axis, pins slidable in the openings, a rod movable in line with the axis of the spindle, and a cross pin iixed on the rod to directly engage said slidable pins; substantially as described.

8. In apparatus of the character described a hollow cylindrical spindle for supporting a hollow work piece, a head on the spindle having an opening parallel to its axis, a pin slidable in the opening, a rod slidable through the spindle and having means to clamp the work piece against the head. and ine-ans on the rod :tor directly engaging and sliding said pin; substantially as described.

9. In apparatus oit the character described, a rotary spindle, bushing sleeved on the spindle and supporting a hollow work piece, a. pin slidable pa allel to the axis of the spindle in line with the bushing and means ,tor sliding the pin to release the bush driven member for loading, by axial movee:

ment, and means for securing the loading sleeve to the driven member; substantially as described.

12. In apparatus of the character described, a hollow spindle having means to support a work piece, a drivingsleeve connected to the spindle, a rod slidably keyed to the spindle and projecting at its ends through the spindle and through the sleeve, said rod having means at one end to engage and hold a work piece, a cam member Supported and slidable on the other end of the rod, a disk and a yoke surrounding the rod, and levers pivoted on the yoke and engaging the disk and the cam member and having connection with the rod to slide the latter; substantially as described.

In testimony whereof I hereunto affix my signature.

WILLIAM CHAPMAN. 

